IBM Z50 - Manual (Page 41)

26 IBM WorkPad z50, Mobile Companion 26
Intermittent Problems
Intermittent system hang problems can be caused by a
variety of reasons that have nothing to do with a hardware
defect, such as: cosmic radiation, electrostatic discharge, or
software errors. FRU replacement should be considered
only when a recurring problem exists.
When analyzing the intermittent problem, do the following:
1. Run the diagnostic test for the mainboard in loop
mode.
2. If no error is detected, do not replace any FRUs.
3. If any error is detected, replace the FRU shown by
the FRU code. Rerun the test to verify that no more
errors exist.
Undetermined Problems
You are here because the diagnostic tests did not identify
which adapter or device failed, installed devices are
incorrect, a short circuit is suspected, or the system is
inoperative. Follow these procedures to isolate the failing
FRU (do not isolate nondefective FRUs).
Verify that all attached devices are supported by the
WorkPad z50.
Verify that the power supply being used at the time of the
failure is operating correctly. (See “Power Systems
Checkout” on page 9.)
1. Enter suspend mode.
2. Visually check them for damage. If any problems are
found, replace the FRU.
3. Remove or disconnect all of the following devices:
a. Non-IBM devices
b. Devices attached to the cradle
c. External devices
d. Battery pack
e. DRAM
f. PC Cards
g. Compact Flash Cards
4. Turn on the WorkPad z50.
5. Determine if the problem has changed.
6. If the problem does not reoccur, reconnect the
removed devices one at a time until you find the
failing FRU.
7. If the problem remains, replace the following FRUs
one at a time. Do not replace a nondefective FRU.
a. Mainboard
b. LCD assembly